Electric-current generator.



H. A. SCHMIDT. ELECTRIC CURRENT GENERATOR. APPLIGATION FILED JAN. 31, 1910.

- Patented Oct. 4, 1910.

1w fim w M r 4 w w r 5 m M 45M & a m 2 L e 6 a a 5 w 1 e w HERMAN A. SCHMIDT, OF CHICAGO, ILLINOIS.

ELECTRIC-CURRENT GENERATOR.

Specification of Letters Patent.

Patented Oct. 4, 1910.

Application -fi1ed January 31, 1910. Serial No. 541,097.

To all whom it may concern:

Be it known that I, HERMAN A. SCHMIDT, a citizen of the United States, residing at Chicago, in the county of-Cook and'State of Illlnois, have invented certain new and useful Improvements vin Electrio-Gurrent Generators, of which the following is a specification.

My invention relates to electric current generators and has for its general objectto provide a miniature generator, manually operable to generate current for the excitation of electric bells and the like, constructed to operate efiiciently for the production of a ringing current upon a slight movement of the prime mover or handle, and of general: structure adapting it practically for the purpose described'and for. easy installation under varying environments as a door-bell generator or the like.

Further objects of my invention are to provide such a hand generator of very small compass,-strong in construction, of small number. of parts, susceptible of manufacture with interchangeable parts, easily assembled, and low in cost. 1

In the drawings, Figure 1 is a vertical sectionloniline 1-1 of. 3; Fig. 2 is a similar section on line 22 of Fig.3, Fig. 3 is a central vertical section;

In the embodiment of my invention shown in the drawings, I providea two-piece casing, generally indicated at 5, comprising a front, supporting base plate, 6', of sheet metal, and a thin sheet metal cap or cover, 7, which, with the base plate, completely inoloses a chamber for the operatlng arts. For securing the cap 7 upon the base p ate 6, said base plate is providedwith side ears, 8, to which the cap is secured by screws, 9.

, The base plate has at its'top and bottom inwardly bent lugs, 10, to which 'is secured a yoke, 11, having oppositely bent extremities, 12, secured tothe lugs 10, as by screws, 13.

prising a train of suitable. ear wheels havmg their arbors or shafts ournaIed in the extremities confronting pole pieces, 18,

The base plate and yoke form a sup-- porting-frame for a multiplying gearcom-,

.and a handle,

preferably separate and detachable from the magnet proper and shaped to include between them a cylindrical armature space. Above and below the pole pieces 18 are diamagnetic bridge plates, 20 and 21, se-

cured to the two pole pieces as by screws, 22, i

and each plate having projecting from its base end an car, 23, secured to the yoke plate, as by a screw,'24. The lower plate 21 pro jects,'as at 21, beyond the sides of the pole pieces so as to receive and support the extremities of the permanent magnet 17 which is further secured in position by a" screw, 25, extending down through the yoke of the horse-shoe magnet and engaging in a suitable threaded aperture in the upper plate 20. One of said plates, preferably the upper plate 20, has extending therefrom a bearing standard, 26, affording support to one extremity of the armature shaft 27, the opposite extremity of which is supported in the yoke 11. Upon the end of the'armature shaft 27 is mounted a'pinion, 28, which meshes with the gear member, 16 of the multiplying train, so that slow rotation of the ower shaft 15 will be transformed into rapid rotation of the armature shaft 27. The armature shaft carries a suitable armature, 29, having one end of its winding connected to the shaft or grounded and its opposite terminal connected to an insulated collecting ring, 30, upon the shaft between the armature and its standard 26, said collecting ring having bearingthereon an insulated spring, 31, to which connection'of one of the exterior wires may bemade through an. approp-riate binding post, 32, fwhile connection of another exterior wire may be made through another binding post, 33, grounded on-.the;frame. I a

The base plate 6 of the with suitable apertures, 35', for the reception of screws, 36, whereby the casing may be secured to any desired support; and in the commercial practice of my inventio'm-I custom-arily provide in connection with the apparatus a suitably finished escutcheon plate, 37 provided with threaded apertures to receive siid screws and with an aperture for the power-shaft 15. Also, in commercial practice, I provide a power shaft 15 of considerable length, preferably about ten inches, I 38., which may be driven or soldered'onto said shaft, in order that the device may be applicable in widely varying environment, the long shaft being suitable casing is provided 7; gearing parts.

for extension through a thick door frame, and the shaft being cut off to appropriate length when the generator is installed in a situation Where the operatinghandle 38 will not be so far removed from the casing.

It will be seen that rotation of the operating handle will rotate the armature and thereby cause the generation of current; and in practice it is necessary only to give the generator handle a turn through an angle of a fewflcgrees to-operate an alternating current bell The generator construction described is small and compact, largely constructed of sheetjmetal parts as to its framing and the like, andis advantageous in its strength, cheapness, lightness, ease of assemblage, and durability. It will be noted that the reduction gear is Wholly supported in t-he'frame provided by the base and yoke, and the permanent-magnet parts are interconnected by the framing bridges, with the armature supported between said frames, so that the structuremjay easily be disassembled to get access to the armature or to the YVhile I have herein described an embodiment-of my invention insome detail it will be apparent to those skilled in the art that changes. in the details of construction might be inade without departure from the spirit and scope of my invention and within the scope of'the appended claims.

What I claim is:

1. In a miniature generator providing a base for attachment to a support, multiplying gearing mounted on said base, means for imparting motion to said gearing, a permanent magnet having confronting polar projections arranged to constitute a field, diamagnetic plates bridging the polar projections above and below the field area and supported from the base, and an armature operatively associated with said multiplying gearing and arranged within the field.

2. In a miniature generator, at horse-shoe magnet having polar projections to provide a field, a diamagnetic bridge'secured to said polar projections and carrying a bearing standard an armature within the field provided with a shaft mounted in said standard,

a pinion on said shaft, multiplying gearing connected ith said pinion, a frame for said gearing coinected to support the diamag netic bridge. and means for communicatin power to said gearing.

3; In a miniature generator, a casing, providing a front plate and a cover; a yoke, supported by said plate; multiplying gearing in the space between the yoke and. plate; a permanent horse-shoe magnet, havingcon: fronting polar projections; bridge plates above and below said projections supported by said yoke, one of said bridge plates having a bearing extension; an armature shaft supported between said extension and theyoke, and operatively associated with the collecting means associated with said armature; and means for imparting power. to said gearing.

In testimony whereof I hereunto .set my hand in the presence of two witnesses.

HERMAN A. sornvnnr.

In the presence of- W. LINN ALLEN, MARY F. ALLEN. 

